Among the companies with shares expected to actively trade in Monday's session are ViroPharma Inc. (VPHM), Transocean Ltd. (RIG, RIGN.VX) and Gogo Inc. (GOGO).

Shire PLC (SHPG, SHP.LN) has agreed to buy ViroPharma for $4.2 billion, extending its bet on the market for medicines treating rare diseases. The purchase price of $50 a share is a 27% premium to ViroPharma's closing share price on Friday and a 64% premium to the price in September before speculation of a deal emerged. Shire's American depositary shares rose 3.7% to $139.36 premarket, while ViroPharma's shares jumped 26% to $49.58.

Transocean said it has entered into an agreement with activist investor and major shareholder Carl Icahn that includes a proposed reduction in the maximum number of directors on its board, while separately announcing plans for an initial public offering of a master limited partnership. The offshore driller's shares rose 2.5% to $54.81 premarket.

Gogo's third-quarter beat-and-raise showed the business that's liable to be generated as fliers continue to seek out wireless services while flying. As of Sept. 30, the company provided service on 24% more commercial planes in North America than a year earlier and had 41% more business jets with its air-to-ground broadband services. Shares rose 19% to $22.25 premarket.

Cloud communication provider 8x8 Inc. (EGHT) agreed to acquire privately held U.K.-based Voicenet Solutions for $18.4 million in cash. Shares fell 4.7% to $10.14 in light premarket trading.

 
   Watch List: 
 

Best Buy Co. (BBY) joins a growing list of retailers trying to extend the much-hyped Black Friday shopping frenzy by opening most of its stores Thanksgiving Day. The consumer-electronics retailer said that more than 1,000 of its stores will open at 6 p.m. local time Thanksgiving Day.

Cohen & Steers Inc. (CNS) said Monday that it will separate the chairman and chief executive roles in January, as the investment management firm divides up the positions among its two namesakes.

Genesee & Wyoming Inc.'s (GWR) consolidated traffic rose 6.3% in October from a year earlier on a pro forma basis, boosted by growth in metallic ores and metals shipments.

IntercontinentalExchange Inc. (ICE) and NYSE Euronext (NYX) said Friday they had received the necessary regulatory approvals to close their deal. ICE's $9.4 billion acquisition of NYSE will close Wednesday, the companies said.

RDA Microelectronics Inc. (RDA) agreed to be acquired by a unit of Chinese state owned Tsinghua Holdings Co. in a deal estimated at $910 million. RDA Microelectronics shareholders will receive $18.50 per American depositary share, a 5.5% premium to Friday's close.

Write to Anna Prior at anna.prior@wsj.com

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